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steel LP 77 overfills .. question

Discussion in 'Tanks, Valves and Bands' started by HeatCker, Jun 10, 2019.

  1. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
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    Yawn
    Please we have heard this so many times in some many ways.
    Yes everyone dies. Can we move on now?
     
    rongoodman likes this.
  2. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
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    I guess whatever suits your fancy. Not much (proportionally) different than filling lp85s to ~3900 except that 2250+ lp72s are 40+ yrs old and have really thin walls to start with - so even a tiny amount of corrosion is a potentially significant weakness. I keep mine to 2800 but I also have lots of other bigger tanks.
     
    Jack Hammer likes this.
  3. runsongas

    runsongas Loggerhead Turtle

    # of Dives: 200 - 499
    Location: California - Bay Area
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    meixner must be the guy driving at the 90 kph speed limit on the highway ... getting honked by the line of cars behind him for holding up traffic
     
    rjack321 and BRT like this.
  4. W W Meixner

    W W Meixner Rebreather Pilot

    # of Dives: 500 - 999
    Location: Ontario Canada
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    ROG...

    Ha...Ha...I'm the only one in our area with one of those ''infernal machines''...everyone else is in horse and buggy...I only have a buggy whip snapped at me occasionally for driving too slow...further...

    From a 3AL S50...I get three 30 minute 130' dives...including stops...with gas to spare...

    With no cylinder over-filling req'd...there is a right way...

    W...
     
  5. divinginn

    divinginn Regular of the Pub

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    I keep mine filled to 3000,a good happy medium without pushing it.
     
  6. Basking Ridge Diver

    Basking Ridge Diver Solo Diver

    # of Dives: 200 - 499
    Location: New Jersey
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    So you overfill and think you are not pushing it? Interesting concept - so if you filled to 3200 and let it cool to 3000 - would that be ok too?

    What seems funny to me is everyone has an idea of what is pushing it - but where do we get the boundary line? At what point do we say we are not pushing it? I will guarantee it is not a scientific line that any of us has measured...

    Once you step over 2250 psi are we all pushing it?
     
    W W Meixner likes this.
  7. BRT

    BRT Orca

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    When we start seeing some failures we are pushing it.
     
    Dark Wolf and carobinsoniv like this.
  8. W W Meixner

    W W Meixner Rebreather Pilot

    # of Dives: 500 - 999
    Location: Ontario Canada
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    BRD...

    Anything over manufacturer stamped working pressure is pushinig it...

    Those who would argue...about over-pressurizing during re-hydro..

    This work is being performed by a trained professional...under controlled circumstances...on a specialized machine...for a very short duration...

    Gas expansion from being in a hot car is a good reason why cylinders should only be filled to WP...

    On some of these threads I hear DIR constantly...but then it seems acceptable to over-fill an old LP cylinder by as much as 1000 PSI...

    I've taken the fill station operator's course...as well as the hydro-static testing course...I understand the logic...I've reviewed the accident statistics...and if resources allow...will only fill to stamped working pressure...allow cylinder to cool down and top up...mine or anyone elses cylinders...and won't allow my cylinders to be over-filled by anyone else...

    I can't see any reason to tax an old 72...when if more gas/range is required...there are H P steel 80's...100's...117's...120's...133's...and 149's...or...rebreathers...

    DIR...

    W...
     
  9. runsongas

    runsongas Loggerhead Turtle

    # of Dives: 200 - 499
    Location: California - Bay Area
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    by that logic, tanks should be filled to less than the rated working pressure after easter until halloween just in case they are stored in a hot car during the summer
     
  10. KWS

    KWS ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: SE TEXAS
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    my lp's hydro like new adn are normally filled to 3500 or more. 4k dfor cave fills. I dont store them full i drain tham down fo rteh winter to a few hunmdred #. the higher the psi the greater the condensation when they cool to say the 30's Psi and temp are both mechanical forms of causeing condensation. That will depend on how good the chemical moisture removal was working at time of fill. If by chance you used something like RIX with no chemical filtering you will get a wet tank inside if temps drop. A lot more if the BPR is set to say 1500 for the moisture separators and you fill to 3k or more. dew points can easily be in the low 30's to low 40's. The higher the psi the higher the dew point.
     

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